Sun Tianyi, Zhao Zhiwei, Liang Zhijie, Liu Jie, Shi Wenxin, Cui Fuyi
State Key Laboratory of Urban Water Resource and Environment, School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
State Key Laboratory of Urban Water Resource and Environment, School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China; Department of National Defense Architecture Planning and Environmental Engineering, Logistical Engineering University, Chongqing 401311, China.
J Colloid Interface Sci. 2017 Jun 1;495:168-177. doi: 10.1016/j.jcis.2017.01.104. Epub 2017 Jan 31.
A novel bifunctional CuO-FeO magnetic material was synthesized and characterized, to remove As(III) through photo-oxidation and adsorption. Photo-oxidation of As(III), adsorption characteristics of CuO-FeO nanoparticles, the effect of solution pH, ionic strength and coexisting ions on As(III) removal were investigated. Under light irradiation, As(III) could be completely oxidized to less toxic As(V) by CuO-FeO nanoparticles within 60min in the photo-oxidation reaction. Simultaneously, As(V) could be adsorbed onto the surface of nanoparticles with high efficiency. The adsorption of As(V) was well fitted by the pseudo-second-order model and the Freundlich isotherm model, respectively, and the maximum adsorption capacities of the nanoparticles was 118.11mg/g at pH 7.0. As(III) could be effectively removed by CuO-FeO nanoparticles at initial pH range from 4 to 8. Among all the common coexisting ions investigated, except for chloride and sulfate, carbonate, silicate and phosphate decreased the As(III) removal by competing with arsenic species for adsorption sites. The synthesized magnetic CuO-FeO combined the photocatalytic property of CuO and the high adsorption capacity of both CuO and FeO, which make it have significant potential applications in the arsenic wastewater treatment.
合成并表征了一种新型双功能CuO-FeO磁性材料，用于通过光氧化和吸附去除As(III)。研究了As(III)的光氧化、CuO-FeO纳米颗粒的吸附特性、溶液pH值、离子强度和共存离子对As(III)去除的影响。在光照射下，在光氧化反应中，CuO-FeO纳米颗粒可在60分钟内将As(III)完全氧化为毒性较小的As(V)。同时，As(V)可高效吸附到纳米颗粒表面。As(V)的吸附分别很好地符合准二级模型和Freundlich等温线模型，在pH 7.0时纳米颗粒的最大吸附容量为118.11mg/g。在初始pH值为4至8的范围内，CuO-FeO纳米颗粒可有效去除As(III)。在所研究的所有常见共存离子中，除了氯离子和硫酸根离子外，碳酸根、硅酸根和磷酸根离子通过与砷物种竞争吸附位点而降低了As(III)的去除率。合成的磁性CuO-FeO结合了CuO的光催化性能以及CuO和FeO两者的高吸附容量，这使其在含砷废水处理中具有显著的潜在应用价值。
